Machine for forming metal tubes.



H. NEUMAN. MACHINE FOR FORMlNG METAL TUBES.

APPLICATION HLED mm. 20. 1914. 1,257,293. Patented Feb. 19, 1918.

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WIN/E8858:

nrromvsrb H. NEUMAN. MACHINE FOR FORMING METAL TUBES.

APPLICATION FILED MAR 20. 1914- 1,257,293. Patented Feb. 19.1918.

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-H. NEUMAN. momma run fdnmmc METAL TUBES.

APPLICATION FILED llMh 20,1914.

Patented lab. 19, 1918.

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MACHINE FOB FOBHIH'G METAL TUBES.

Patented Feb. 19, 1918.

Appllbatlcn fled latch 20, 1914. Berla11Io.8I$,990.

To all 'wlwqn it ma concern Bait-known hat I, Hnoo NEWMAN, a citizen of the United States of America, residing at Ford, City, in the Provincq; .of On-' tario and Dominion of'Canada, hive invented certain new and useful Improve- 1 ments in Machines for Forming Metal Tubes, of which the following is a specification, reference being had therein to the accompanying drawingsn T e invention re ates to tube-forming machines, and has for its ob'ect the obtaining of a construction adapte for the manufacture of channeled tubes, ch as. are used for wind-shield frames and or similar purposes. It is a further object to form the tubes froma plurality of fiat strips of sheet metal, which are separately formed to the desired cross section and then united and seemed together.

In the drawings: Figurelis a i'ront elevation of the ma chine; i

- Figs 2' to 8 inclusive are cross sections of 85 the main blank in various stages of forma tion;

Figs. 9 and 10 are end elevations of the dies; i

Figs. 11 to 15 inclpsive are similar views illustrating the progressive formation of the auxiliary blank;

Figs. 16, 17 and 18 are similar views showing the operations of seamin the two blanks together to form the comp eted tube;

Fig. 19 is a cross section through one of the bearings for the shaft of the forming roll showing the adjustment and tensioning means; and

Fi is a cross section through the com- 40 plete tube;

A- is a suitable frame, u on which are mounted airs of forming ro ls arranged in series an adapted to successively operate .upon a sheet metal'blank. All or a part of these rolls are positively driven by suitable mechanism, not shown, and the individual rolls are exchangeable to form strips of diffprent contour. As shown in Figs..2 to 10 inclusive, the flat strip B is first fed be tween fiat rolls C C, and then passes to the first pair of forming rolls D D, which'bend it into a slightly reversal -curved cross sec tion, illustrated in Fig. The strip next en agesja pair of forming rolls E E which 56 bend it into the section shown in Fig. 4=v and then is successively operated upon b the pairs of forming rolls. F F, G G, H,

I, which progressively fashion it, as ilhm trated in Figs. 5 to 8,, It will be ObSBIVQA'i. that in these successive operations a Chalknel I strip. is formed, having its opposite ed es provided with reversely-bent flanges. is a reel, preferably mounted upon the frame A and carrying a coil of previouslyform'ed strip, which is complementary to the main strip in forming the tube. This complementary strip is preferably formed upon the same machine by an exchangeable set of rolls, illustrated in Figs. 11 to 15, which progressively fashion the cross section from the flat to a U-shaped channel having reverse-bent flanges. The strip K thus fashioned is wound upon the reel J, from which it is fed into engagement with the strip B. Before, however, the two strips comeinto' engagement, the strip B passes from the rolls I and I through stationary forming dies L and M, shown respectively in Figs. 9 and 10, the former deepening the channel and the latter bending the edge portions inward and the intermediate portion into thesegment of a circle. Thus when fed from the die M, the flanges or hooks a of the strip B will pass into the reversebent hooks b of the strip K, as shown in Fig. 16, this being performed while the strips are passing through stationary dies N. From this oint the strip is fed toka, pair of rolls 0 8, which, as shown in Fig.- 17, initiate the closing of the seam, while the pair of rolls P P, together with an in' -T" termediate roll P complete the seaming. operation. The rolls such as O and O are driven in timed relation to the fastening rolls I and I, etc., by any suitable driving mechanism such as the sprocket and chain drive shown in Fig.2. The invention, however, is not directed to any specific construction ,of driving mechanism.

The tube when delivered from the machine rolls hav-I ing a. fixed space therebetween, slight irregularities in the gage of the metal will cause a drawin at one point morethan at another, which wi 1 result in bending or warping the strip. This is avoided in my construction ,by 'ayieldable and adjustable bearing for the forming rolls illustrated in Fig. 19.

This bearing comprises an eccentric sleeve Q,

in which the shaft R of one of the rolls is journaled, said sleeve bein rotatively adiustable by a lever or hand e S. When the ever or handle S is adjusted in one direction, it will, by the cam action of the es by set screws as shown in Fig. 1. T is av bearin block for the sleeve Q, which. is yielda ly held in position by a spring U which an ges a recess in said block and bears agalnstan' abutment V, which is adjustable by a mw W passing through cap X. The arrangement is such that by proper adjustment of the screw W, the tension of the spring U. ma be so adjusted that the eccentric sleeve is permitted to yield so as to avoid drawing and warpin the metal of the strip. On the other hen the tension is sufiicient to produce the necessar frictional engagement between the rolls an the strip, so that the latter will be formed to the proper contour.

What I claim as my invention is The combination with a frame, of a series of pairs of forming rolls mounted on said frame and adapted to progressively fashion a sheet metal strip, seami rolls arranged in alinement with said serles of rolls, stationary formin dies between said series of rolls and seaming rolls, and means for delivering a complementary fashioned strip to said intermediate dies into engagement with the strip fed from said series of rolls, Where by said seaming rolls will unite the engaged strips.

In testimonv hereof I afiix my signature in presence oi we itnesses.

HUGO NEUMAN.

Witnesses:

WM. J. BELKLNAP, James P. BARRY. 

